20ft. White Plastic #10 Chain - With 4 Connectors For Vertical Blinds, Roller Shades & Roman Shades. Ball diameter is 4.5 mm. with 6 mm. spacing between center of one ball to center of next ball. (see photo 2) Shows Included chain connectors that work like a clam shell snapping closed around both ends of the beaded chain. A 15% restocking fee or more will be charged for returnsDepending on the condition when we receive.